Sugar substitutes differ from regular sugar mainly in their chemical nature, metabolism, suitability for the population, and whether they increase blood sugar. Sugar substitute is a substance that does not break down into glucose and does not produce calories; common sugar can break down into glucose and supply energy to the body, which will cause blood sugar to rise and is not suitable for people with diabetes. 1. Different chemical properties: Sugar substitute is a substance that does not decompose into glucose, but has a sweet taste; whereas common sugar refers to polyhydroxy aldehydes or ketones, which can be hydrolyzed and turned into glucose to provide the body with organic compounds for energy. 2. Metabolism is different: Sugar substitute cannot produce heat, or produces less heat than common sugar, and is seldom absorbed by the body; while the main role of common sugar is to increase heat. About 70% of the energy needed by human body is provided by common sugar, which releases a large amount of energy after a series of chemical decomposition in human body for the body to use. 3. Suitable for different groups of people: sugar substitute is suitable for healthy people, diabetes and weight loss people can also eat; ordinary sugar is not suitable for diabetes, weight loss people. 4. Whether to increase blood sugar: sugar substitute is seldom involved in metabolism, seldom absorbed by the body, and has little effect on the level of blood glucose and ketone bodies in the body; whereas ordinary sugar, when ingested into the body, will cause an increase in blood glucose, and promote the secretion of a large amount of insulin. Patients with diabetes and obesity should have a reasonable diet and treatment under the guidance of a doctor.